Re: NSTimer

[Richard Frith-Macdonald]

On 27 Feb 2009, at 01:58, Scott Christley wrote:

> Hello,
>
> I'm using the latest code from SVN.  My program is using a repeated  
> NSTimer much like this sample code, and it no longer seems to be  
> working.  Not sure how long ago it stopped working, I haven't used  
> my code in many months.  The run loop is returning immediately  
> instead of firing off the message, anybody know what the problem is?

You need to have some input source in the run loop (a timer doesn't  
count) or it will return immediately, as specified in the Apple docs.
There used to be a bug where the loop would block forever rather than  
return immediately, and I guess your code was depending on that.

The behavior on MacOS when I tested it was strange and  
inconsistent ... sometime the loop returned immediately as documented,  
sometimes it blocked.  My suspicion is that MacOS-X has an  
undocumented feature of sometimes putting input sources in the run loop

Anyway, the way to do what you want is to use one of the mthods to run  
the loop in conjunction with limitDateForMode: and [NSThread- 
sleepUntilDate:]